I wrote it that way its a single pick answer that is a rule with Radio Buttons, it resets which button is high lighted so when run again and want same button would just pick OK.
You only need the 3 lines of code for it to work the (if (not AH:Butts)(load "Multi Radio buttons.lsp")) will load the code automatically from a directory, 2 methods make sure Multi Radio Buttons.lsp is saved in a "Support" directory. Or change the load to full path eg (load "d:\\alan\\lisps\\Multi radio buttons.lsp") so it does not need to live in your code.
You can use the if not on other providers a good example is the excellent code provided by Lee-mac.com.
(if (not LM:readcsv)(load "Readcsv-V1-3"))